How is the lunar calendar calculated, and how is the lunar calendar calculated?

How to calculate the lunar calendar is based on the change of the moon The moon revolves around the earth, and the moon will have clouds and sunny days According to this, the lunar calendar formulated Basically, the ancient date rules in the world are based on the moon, and there are also stars that use the sun.

1. Lunar calendar

Lunar calendar, the traditional Chinese calendar. It varies according to the cycle of the phases of the moon, and each phase of the moon changes to one month; And divide a solar return year into 24 segments, forming 24 solar terms. By referring to the solar return year, a leap month is set to adapt its average calendar year to the return year.

The lunar calendar merges the lunar and solar calendars to form a lunisolar calendar.

The lunar calendar is also known as the summer calendar, the lunar calendar, the old calendar, the Chinese calendar, and the Chinese calendar. Due to the use of "Xia Zheng", it was mostly called the summer calendar in the old days, and after 1970, the "summer calendar" was renamed the "lunar calendar". The lunar calendar is a lunisolar calendar, and its years are divided into ordinary years and leap years.

Twelve months in a normal year; Leap years are thirteen months. Months are divided into major months and minor months, with the major month having 30 days and the minor month having 29 days, and its average calendar month is equal to one synodic month.

2. Gregorian calendar

The solar calendar, also known as the solar calendar, is a calendar based on the cycle of the earth's revolution around the sun.

The calendar year of the solar calendar is approximately equal to the return year, which is 12 months of the year, and this "month" is actually unrelated to the synodic month.

The months and days of the solar calendar are in good agreement with the position of the sun on the ecliptic, and according to the dates of the solar calendar, the changes of the four seasons can be clearly seen in the year; But in each month, the moon's new signs, hopes, and strings are not visible.

The Gregorian calendar that is now used in the world is a kind of solar calendar, with 365 days in a normal year, 366 days in a leap year, a leap every four years, a less leap once every 100 years, and a leap again in the 400th year, that is, there are 97 leap years in every 400 years. The average length of the calendar year in the Gregorian calendar is only 26 seconds away from the return year, and it is only one day to accumulate 3,300 years.

3. Lunar calendar

The lunar calendar is one of the traditional Chinese calendars, also known as the old calendar, the Han calendar, the ancient calendar, etc., after the Xinhai Revolution, the Western solar calendar (Gregorian calendar) was used, and the modern name of the lunar calendar belongs to the lunisolar calendar.

In the traditional Chinese calendar, the lunar calendar mainly refers to a calendar arranged according to the changes in the lunar phase cycle of the moon, that is, a calendar that uses the synodic month as the basis for determining the calendar month, and the year is twelve calendar months. In the process of the development and evolution of the calendar, it was combined with the 24 solar terms in the Ganzhi calendar to form the lunar calendar (Han calendar), which was used to scientifically guide agricultural production. Although the lunar calendar and the lunar calendar are commonly known as the ancient calendar, the Han calendar, and the old calendar, there is a difference between the lunar calendar and the lunar calendar (Han calendar), and the traditionally used lunar calendar (Han calendar) is actually a lunisolar calendar, not a lunar calendar in the traditional sense.

The lunar moon is based on the law of the moon's motion: the moon's orbit, called the white way, the white path and the ecliptic are two large circles on the celestial body, oblique to five degrees and nine minutes, the moon circles the earth once, haunts the ecliptic twice, lasts 27 days, 7 hours, 43 minutes, 11 and a half seconds (day), the time required for the moon to revolve around is called the "sidereal month". However, when the moon circles the earth, the position of the earth also changes due to the revolution around the sun, and the moon travels thirteen degrees and fifteen minutes every day, so the moon from the conjunction, the whole circle of the earth, and the repetition to the conjunction, it actually takes 29 days, 12 hours, 44 minutes, 2 seconds and 8 seconds (days), which is called the "synodic month", and the custom of the so-called month refers to the synodic month.

The steps of the lunar calendar algorithm are as follows:

The calculation is based on Beijing time, and the lunar day on which the new day is located is the first day of the lunar month. China's lunar calendar emphasizes the calculation of each year and month by month, and only after the month-by-month calculation can we know whether a certain month of a certain year is a big month or a small month; After calculating from year to year, it is possible to know whether a certain year is a leap year or a common year.

The lunar calendar is basically 12 months as a year, but the time of the 12 synodic months is a day, and the return year is about 11 days apart, so that every 3 years there will be 33 more days, that is, more than a month, in order to eliminate the extra days, every 3 years to add a month, this is the leap month of the lunar calendar.

The order of the day is determined by the phases of the moon. That is, the date and time of the conjunction of the sun and the moon are used to determine the first day of the month. For example, if 6:05 a.m. is the conjunction of the sun and the moon, then today is the first day of the new year.

If the second conjunction falls on the 30th day, then the month is a minor month (29 days); If it falls on the 31st day, then the month is the Great Moon (30 days).

The order of the month is determined by the middle air. China's old calendar divides the year into 24 solar terms, of which the singular number is called the solar term, and the even number is called the middle air. The month in which the rain is located is the first month; February is defined as the month in which the vernal equinox falls; And so on.

The origin of the lunar calendar:

The lunar calendar, China's current modern calendar, belongs to the lunisolar calendar, that is, the lunar calendar and the solar calendar, is based on the change cycle of the moon phase, each moon phase synodic change to one month, referring to the solar return year for the length of one year, and add 24 solar terms and set leap months to make the average calendar year and the return year adapt.

The lunar calendar fuses the lunar calendar and the solar calendar to form a lunisolar calendar, which was called the summer calendar in ancient times because of the use of "Xia Zheng". The lunar calendar is a new calendar used after 1970, and its years are divided into common years and leap years, with a common year of twelve months, a leap year of thirteen months, and the months are divided into major and minor months, with a large month of thirty days and a small month of twenty-nine days, and its average calendar month is equal to one synodic month.

According to the national standard "Compilation and Promulgation of the Lunar Calendar" drafted by the Purple Mountain Astronomical Observatory of the Chinese Academy of Sciences, the new day is the first lunar day of the lunar month, which means that the first day of each lunar month must be the new lunar day.

Each lunar month reflects the complete cycle of moon phase change and is therefore part of the lunisolar calendar. The 24 solar terms in the lunar calendar reflect the different positions of the earth in its orbit around the sun, i.e., the return year cycle, and therefore belong to the solar part of the lunisolar calendar.

The lunar year is 12 or 13 months, and the number of days in each month is 29 or 30 days depending on the moon's orbit around the earth, 13 months in leap years, 353 or 354 days in a normal year and 384 or 385 days in leap years, with an average of about one day per year (i.e., the time it takes for the earth to orbit the sun).

The lunar calendar is basically based on a 19-year cycle, because the lunar calendar year is about 355 days, and the difference with the earth year is about 11 days, so every 3 years to place a leap month, every 19 years to put 7 leap months. A year with a leap month is also called a leap year, and the specific leap month depends on the solar terms. For example, May 27, 2001, May 27, 1982 and May 27, 1963 in the Gregorian calendar are all the fifth days of the fourth month of the leap month.

The month to which the leap month is added is inferred from the rules of the lunar calendar, and is mainly determined according to the correspondence with the 24 solar terms of the lunar calendar. Since the beginning of the winter solstice, every singular number is the solar term, and every even number is the middle air, such as the turn of a month only the solar term and no middle air, that is, the leap month of the previous month. The number of leap months in the lunar calendar is the same as the number of days in a normal month, which is 29 or 30 days.

1.The lunar calendar is a kind of calendar that is still used in China, and generally speaking, the lunar calendar corresponds to the Gregorian calendar. 2.

The lunar calendar is a lunisolar calendar, that is, the combined calendar of the lunar calendar and the solar calendar, the lunar calendar is the calendar determined according to the movement of the moon and the solar calendar, and the solar calendar is the calendar established according to the movement of the sun. 3.According to the change cycle of the moon phases, each lunar phase synodic change is a pure moon, referring to the length of the solar return year as a year, and adding "24 solar terms" and setting "leap months" to adapt the average calendar year to the return year.

4.The lunar calendar is divided into ordinary years and leap years, with 12 months in a normal year and 13 months in leap years; The month is divided into a big month and a small month, the big month is 30 days, the small month is 29 days, and the year is about 354 or 355 days, which is about 11 days less than the 365 days of the Gregorian calendar, so the lunar calendar and the Gregorian calendar do not completely coincide.

The lunar calendar is a traditional calendar adopted in China, also known as the summer calendar, the middle calendar, the old calendar, and the folk also called the lunar calendar. It uses a strict synodic cycle to determine the month, and uses the method of setting leap months to make the average length of the year similar to the return year, and has the properties of both lunar months and solar years, so it is essentially a lunisolar calendar. The lunar calendar takes the date of the conjunction of the sun and the moon (the sun and the moon have equal ecliptic longitude) as the first day of the month, that is, the first day of the new month.

The average length of a synic month is about a day, so some months have 30 days. Weigh the moon big; Some months are on the 29th, which is called the small month. The date of the beginning of the month is calculated according to the position of the sun and moon and is not mechanically arranged.

The lunar calendar takes 12 months as a year, with a total of 354 or 355 days, a difference of 11 days from the return year. To this end, it is coordinated by inserting seven leap months every nineteen years. The arrangement of the leap month is determined by the 24 solar terms.

The lunar calendar takes the time of the full and missing moon once in one month, a total of 29 and a half days. In order to make it easier to calculate, the big moon pants are made for 30 days, the small month is 29 days, and in December of a year, the large and small months are roughly alternated. There are about 365 days in a lunar year, and there is no difference between ordinary and leap years.

The lunar calendar does not take into account the movement of the earth around the sun, so the change of the four seasons does not have a fixed time on the lunar calendar, and it cannot reflect the seasons in the open field, which is a big disadvantage. In order to overcome this shortcoming, people later set a new calendar, the so-called lunisolar calendar. The summer calendar (also called the lunar calendar or lunar calendar) that is still in use in China is this lunisolar calendar.

Like the lunar calendar, it is set as a month when the moon is full and absent once, that is, 30 days in the big month and 29 days in the small month, but it also uses the method of adding leap months to make the average number of days in a year close to the number of days in the solar calendar to adjust the four seasons. The lunar calendar has a leap month every two or three years. ～

Not every month is 30 days, there are 29 days. The decision to be 30 days or 29 days is to ensure that the moon is the roundest on the fifteenth day of each month, which requires astronomical calculations to determine which month is 30 days or 29 days, so the large and small months of the lunar calendar are not fixed like the Gregorian calendar. This is due to the difference between the epoch law of the lunar calendar and the Gregorian calendar.

The lunar calendar is based on the time it takes the moon to make one revolution around the earth, while the Gregorian calendar is based on the time it takes the earth to orbit the sun. Comparatively speaking, the epoch method of the Gregorian calendar is more in line with the actual situation. For more information, please see the following information.

Answer: There is no pattern to this, and it can only be arranged by calculation. Because the time for the moon to circle the earth is 29 5306 days, a total of 354 3672 days in 12 months, which is less than the time for the earth to circle the sun in 365 2422 days, so the number of days in the lunar month can only be selected between 29 and 30, but it is also necessary to ensure that the moon is the roundest on the night of the fifteenth day of each month, which requires astronomical calculations; This is how it has not been solved, because the 12 months of the lunar calendar add up to a little more than 354 days, and it is nearly 11 days away from the real year, so a leap month is added in about 3 years, so the lunar calendar date and the position of the earth's movement around the sun do not correspond accurately, for example, the winter solstice day, which represents the farthest time from the earth to the sun, the Gregorian calendar is on December 22, the time difference is one day, but the difference in the lunar calendar is big, last year was the third day of November, this year is November 13, a difference of 10 days, So the lunar calendar is not as accurate as the Gregorian calendar.

Summary. Hello dear, the lunar calendar algorithm is as follows: the lunar calendar is the traditional calendar of our country, and there are names such as the lunar calendar, the Chinese calendar, the summer calendar, the Han calendar, the national calendar, etc., but the lunar calendar is not a lunar calendar but a luni-solar calendar.

The length of the year, by setting the twenty-four solar terms and the leap month to adapt the average calendar year to the return year, the operation method 01 month is the first day of the lunar month. The 0224 solar term divides the astronomical year into 24 parts according to the angle of the sun, and the solar term is 15 degrees. 03 The winter solstice must fall in the winter month of the lunar calendar, if it does not fall, it is necessary to add a month before the wax month as a leap month.

04 The first month after the winter moon of a leap year without a major solar term is a leap month. 05 The lunar year is based on a 60-year cycle. 06 The calculation of rules 1 and 2 is based on the observations of the Purple Mountain Observatory in Nanjing, China.

Hello dear dear, the lunar calendar algorithm is as follows: the lunar calendar is the traditional calendar of our country, and there are names such as the lunar calendar, the Chinese calendar, the summer calendar, the Han calendar, the national calendar, etc., but the lunar calendar is not a lunar calendar but a luni-solar calendar. The length of the year, by setting the 24 solar terms and the leap month to adapt the average calendar year to the return yearOperation method 01 The day when it is completely dark is the first day of the lunar month.

The 0224 solar term divides the astronomical year into 24 parts according to the angle of the sun, and the solar term is 15 degrees. 03 The winter solstice must fall in the winter month of the lunar calendar, if it does not fall, it is necessary to add a month before the wax month as a leap month. 04 The first month after the winter moon of a leap year without a major solar term is a leap month.

05 The lunar year is based on a 60-year cycle. 06 The calculation of rules 1 and 2 is based on the observations of the Purple Mountain Observatory in Nanjing, China.

Pro, the algorithm of the Chinese lunar calendar is summarized as follows: 1. China's lunar calendar is a lunisolar calendar used before 1912. 2. China's lunar calendar emphasizes the calculation of the cherry base nucleus month by year.

After the ridge digging is calculated month by month, it is known whether a certain month of a certain year is a big month or a small month; After calculating the front hall from year to year, we know whether a certain year is a leap year or a normal year. 3. China's traditional calendar has always been a lunisolar calendar and the 24 qi in parallel, and the 24 qi is suitable for agricultural production. 4. China's traditional calendar adopts the chronological system of the stem branch cycle (60 jiazi) as the cycle.

What is the lunar month and date of August 20 in the new calendar in 2023? Give me the most accurate answer.

Dear, August 20, 2023 is the fifth day of the seventh lunar month.

The fifth day of the seventh month is the day of the month.

Give the most accurate answer Do you call this an accurate answer?

The pro-lunar calendar is July 5th.

Gongxin only file calendar: August 20, 2023 Sunday of the 2023 lunar calendar on the fifth day of the seventh month of the third year of the mountain faction: 癸卯年 庚申月庚戌日.

So why do others say it's July 21st?

Dear, July 5th is right.